If someone will explain to me "the speed of liberation" to escape a star ... For the Earth it is 11,2 km / s (or 40 km / h).
Why an airplane (while heading immediately vertically) cannot escape if it only goes to mach 1 if it takes its oxidizer / fuel on board! He won't stop if he goes to mach1 ??
The speed of release, or speed of escape or escape is, in physics, the minimum speed that a projectile must reach to definitively escape the gravitational attraction of a star (planet, star, etc.) devoid of atmosphere and move away from it indefinitely. This speed is all the more important as the mass of the star is important and the object is close to its center. Relative to the star, it is a scalar value (its direction plays no role). This speed is greater than the minimum orbiting speed necessary for the object to be able to place itself in orbit around the star.
https://fr.wikipedia.org/wiki/Vitesse_d ... 3%A9ration